Automation refers to the process of machine equipment, system or process (production, management process) without the direct participation of people or less people, according to the requirements of people, through automatic detection, information processing, analysis and judgment, manipulation and control, to achieve the expected goal. Automation technology is widely used in industry, agriculture, military, scientific research, transportation, business, medical care, services and homes. The use of automation technology can not only liberate people from heavy physical labor, part of the mental work and bad, dangerous working environment, but also expand the function of human organs, improve labor productivity, and enhance human's ability to understand the world and transform the world. Therefore, automation is an important condition and a significant sign of the modernization of industry, agriculture, national defense and science and technology.